Is Bertie County, NC a radon risk area?

EPA's own radon map rates Bertie County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Bertie County sits at the 11th percentile nationally for radon potential — above 11 of every 100 rated counties.

Bertie County by the numbers

About 16,939 people live in Bertie County, North Carolina, spread over 699.176 square miles. That works out to roughly 24 people per square mile. Rank 679 by population within its EPA zone puts Bertie County at the 34th percentile among zone peers. EPA's geology-based Region 4 groups Bertie County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Bertie County

At Zone 3, Bertie County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. A Zone 3 rating means Bertie County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Next steps for a home in Bertie County

Nothing about Bertie County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find North Carolina's state radon program

Bertie County's test kit answers today; a Airthings radon monitor keeps answering for Bertie County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.